12. h3h4 A great move by a tactical magician in his element. 12... g5h4 Black's position goes downhill very fast after this. 13. g4g5 This is the point. White threatens to take on h6 and if Black captures on g5, a dangerous knight will go to this square. 13... f7f5  14. g5h6 Accurate play - Firouzja will give no chance until the end of the game.